Ответ:

Grammar

  1. We ........ a duration.
  2. are driving

  3. When he ........ .
  4. arrives

  5. It's 1:00. The .........
  6. are missing

  7. When .........
  8. John

  9. That's a ........ .
  10. going

  11. If she ........ .
  12. has

  13. We ........ .
  14. are

  15. If I go ........ .
  16. visit